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UNAS Underwater Noise Analyzer
The UNAS Underwater Noise Analyzer is a real-time system for the analysis and transmission of underwater noise. Building upon core strengths in low power consumption and low intrinsic noise, it supports dual operational modes: autonomous recording and real-time online transmission. Featuring a compact and lightweight design, the device can be deployed on buoys, seafloor platforms, or mobile observation platforms. It is equipped with a built-in rechargeable battery providing an autonomous endurance of ≥48 hours; alternatively, it can be powered by the host platform for long-term, continuous online monitoring, transmitting real-time noise data and spectral information via Ethernet or RS485 interfaces.
Multiple units can leverage the host platform’s clock to facilitate distributed, synchronized observations with a synchronization accuracy of better than 1 μs. The system is widely applied in fields such as marine noise online monitoring, acoustic tracking of marine mammals, and underwater engineering noise assessment, and is available in versions tailored for both coastal and deep-sea environments.
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Smurf Self-contained Hydrophone Array
Smurf is a deep-sea digital hydrophone designed on a ultra-low-power platform. Compact and highly portable, it enables high-precision acquisition of underwater acoustic signals and supports long-duration autonomous operation. The device features a high-speed USB interface for direct connection to a computer, allowing for data retrieval without the need to open the housing. It supports synchronized cable-based array configurations, expandable up to 128 elements, with a synchronization accuracy superior to 1 μs—ensuring that timing errors do not accumulate over time.
With self-noise levels lower than Sea State 0, its pressure-resistant titanium alloy structure is engineered for deep-sea environments down to 6,000 meters. Widely deployed in marine acoustic surveys, deep-sea scientific research, bio-tracking, environmental noise monitoring, and large-aperture array observations, Smurf stands as the premier choice for portable deep-sea acoustic observation.
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LoPAS-L Ultra-Low Power Self-Contained Acoustic Recorder
The LoPAS series consists of ultra-low-power, self-contained underwater acoustic sensing devices. Featuring embedded low-noise signal processing modules and utilizing piezoelectric sensing technology, these devices enable the simultaneous acquisition of underwater acoustic signals and depth/temperature data, as well as long-duration, autonomous recording. The devices’ self-noise levels are lower than those of Sea State 0 conditions; furthermore, their ultra-low-power architecture ensures stable and reliable operational endurance. The series supports synchronized multi-device array deployment—achieving synchronization accuracy superior to 1 μs—with array apertures capable of covering the full ocean depth.
The LoPAS series employs a universal mounting structure, allowing for easy integration into various platforms such as subsurface moorings, buoys, and offshore observation stations. It is widely applied in fields including marine acoustic surveys, offshore scientific research, bio-tracking, wind farm noise monitoring, and underwater environmental impact assessments.
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ARMS Infrasonic Noise Monitor
The ARMS Underwater Acoustic Noise Monitor is an underwater noise monitoring instrument independently developed by Haiyan Electronics. It is an integrated acoustic signal acquisition device designed for applications such as marine acoustic monitoring, underwater scientific exploration, and underwater noise measurement. The product features core advantages including a wide frequency response range of 10 Hz to 10 kHz, low equivalent self-noise, and high receiving sensitivity. Utilizing a self-contained, integrated design, it is capable of independently performing in-situ acquisition and storage of underwater acoustic signals without the need for complex external acquisition equipment.
With its stable performance and precise measurements, the ARMS Underwater Acoustic Noise Monitor serves as an ideal specialized instrument for marine environmental monitoring, underwater engineering surveys, and acoustic marine research.
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VS32 Vector Hydrophone
Frankstar VS32 is a 3D vector hydrophone that adopts a piezoelectric velocimeter as its sensing element. It is widely applicable to acoustic detection, underwater acoustic arrays, underwater towed vehicles and other related fields.
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VS22 Vector Hydrophone
As a 2D vector hydrophone, Frankstar VS22 utilizes a magnetoelectric velocimeter for signal sensing. It is suitable for application in acoustic detection, underwater acoustic array systems and underwater towed platforms.
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SPH6025 Broadband Spherical Hydrophone
Frankstar SPH6025 broadband spherical hydrophone features an operating frequency range from 1 Hz to 90 kHz, with a typical receiving sensitivity of -200 dB re 1V/μPa. The capacitance of the piezoelectric element is 30.5 nF. It maintains excellent signal-to-noise ratio even when transmitted via long extension cables. Boasting outstanding acoustic performance and high durability, the SPH6025 is applicable to a wide range of underwater acoustic measurement scenarios.
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SPH6020 Broadband Spherical Hydrophone
Frankstar SPH6020 Broadband Spherical Hydrophone offers an operating frequency range from 1 Hz to 120 kHz, with a typical sensitivity of -203 dB re 1V/μPa. The piezoelectric element has a capacitance of 19.5 nF, and it maintains an excellent signal-to-noise ratio even when using long extension cables for transmission.Delivering superior acoustic performance and exceptional durability, the SPH6020 is well-suited for a diverse range of application fields.
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SPH6015 Broadband Spherical Hydrophon
The Model SPH6015 broadband spherical hydrophone operates from 1Hz to 150kHz with a typical sensitivity of -207dB re.1V/μPa and a piezoelectric element capacitance of 11.5nF. It maintains excellent signal-to-noise ratio even when used with long extension cables. Featuring outstanding acoustic performance and durability, the SPH6015 is suitable for various applications including biological monitoring and underwater acoustic measurement.
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SPH6010 Broadband Spherical Hydrophone
The Model SPH6010 broadband spherical hydrophone operates from 1Hz to 250kHz with a typical sensitivity of -211dB re.1V/μPa and a piezoelectric element capacitance of 6.5nF. It maintains excellent signal-to-noise ratio even when used with long extension cables. Featuring outstanding acoustic performance and durability, the SPH6010 is suitable for various applications including biological monitoring and underwater acoustic measurement.
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HPA200 Broadband Hydrophone
The Model HPA200 broadband hydrophone operates from 1Hz to 170kHz with a typical sensitivity of -211dB re.1V/μPa and a piezoelectric element capacitance of 6.9nF. It maintains excellent signal-to-noise ratio even when used with long extension cables. Featuring outstanding acoustic performance and durability, the HPA200 is suitable for various applications including biological monitoring and underwater acoustic measurement.
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HPA45 Deep-Sea Hydrophone
The Model HPA45 deep-sea hydrophone operates from 1Hz to 50kHz with a sensitivity of -195dB re.1V/μPa and a maximum operating depth of 6000m. It features excellent acoustic performance and durability, suitable for various underwater acoustic applications such as array elements, buoys, submersible buoys, underwater gliders and wave gliders.
